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Class 11MathematicsPermutations and CombinationsPermutationsExpert
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(5) distinct red balls and (4) distinct blue balls are arranged in a row. If all blue balls stay together, how many arrangements are possible?

Answer and explanation

Correct answer: (17280)

Treat the (4) blue balls as one block, giving (6!) outside arrangements and (4!) internal arrangements. Exam tip: count internal orders for distinct objects inside a block.

Related tags

PermutationsBlock MethodDistinct BallsClass 11Permutations And CombinationsMathematicsClass 11 Mcq
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